ABC News(LOS ANGELES) — The Thomas Fire, the worst of five wildfires currently burning in California, grew by more than 50,000 acres on Sunday, making it the fifth-largest wildfire in the state’s history, fire officials said.

The inferno just north of Los Angeles in Ventura and Santa Barbara counties is being fought by about 6,400 firefighters.

So far, officials estimate the Thomas Fire has charred about 230,500 acres, the equivalent of about 360 square miles. It has consumed 794 structures and damaged about 190 others, with 18,000 buildings still at risk.

The peril of the blaze, which has burned wildly for a week, has prompted the evacuation of tens of thousands of residents.

In Santa Barbara County alone, more than 30,000 residents were forced from their homes under evacuation warnings.

Perhaps most critical is that the Santa Ana winds persist, keeping firefighters struggling with gusts at around 35 to 45 mph, Cal Fire officials confirmed.

However, in a promising turn, despite the fire’s perimeter spreading over the weekend, the Thomas Fire is now back to 15 percent contained — up slightly from Sunday evening.

The state has spent more than $34 million on efforts to suppress the Thomas fire, which has also knocked out electricity for thousands of area residents, authorities said.

“[We’re] facing a new reality in the state,” California Gov. Jerry Brown said Saturday as he surveyed damage in Ventura County. “It’s a horror and a horror we need to recover from.”

He said drought and climate change have exacerbated the wildfires.

From now on in California, Brown said, fires are going to be more “intense” and a greater danger to lives and property.

“Individuals need to come together to make our communities livable,” he said.